Compact projection lens

Details Compact projection lens Compact projection lens

1985-11-25

1987-09-01

Corbin, John K.

350412, G02B 912, G02B 934, G02B 1318

Patent

active

046905154

ABSTRACT:
A compact projection lens for projecting an enlargement of an image appearing on a cathode ray tube (CRT) onto the screen. The projection lens has a first lens having a positive optical power and at least one aspheric surface, surface of the first lens that faces the screen being convex, a second lens having bi-convex surfaces and a positive optical power, and a third lens having a negative optical power and an aspheric concave surface facing the second lens. The focal length f.sub.1 of the first lens and the focal length f.sub.2 of the second lens are selected for satisfying a condition of

REFERENCES:
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1982-09-01), Betensky
patent: 4548480 (1985-10-01), Yamamoto et al.
patent: 4564269 (1986-01-01), Uehara

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